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<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
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<body>
  <script>
    let ary1 = [1, 2, 3];
    let ary2 = [4, 5, 6];
    // ...ary1  			// 表示将ary1数组拆分成1, 2, 3
    // ...ary2  			// 表示将ary2数组拆分成4, 5, 6
    let ary3 = [...ary1, ...ary2];
    console.log(ary3);	// (6) [1, 2, 3, 4, 5, 6]
  </script>
</body>
</html>